{"instruction": "You are an expert in relationship extraction. Please extract relationship triples that match the schema definition from the input. Return an empty list for relationships that do not exist. Please respond in the format of a JSON string.", "schema": ["cause effect", "entity origin", "member collection", "instrument agency"], "input": "one of the grand canyon tour guides has a barren of mules for the tourists to ride down into the canyon ."}
{"cause effect": [], "entity origin": [], "member collection": [{"subject": "barren", "object": "mules"}], "instrument agency": []}